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The Business Impact of Iterative Pre-stack Depth Migration of Wide Azimuth Seismic in PDONormal access

Authors: T.N Al Raisi, H.J. Dejong and B.J. Michels
Event name: Fourth EAGE Exploration Workshop
Session: Advances in Seismic Processing: The Impact on Improved Interpretation
Publication date: 02 May 2017
DOI: 10.3997/2214-4609.201700214
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 3.54Mb )
Price: € 20

Summary:
This paper focuses on the interpretation efforts and its importance required for successfully building accurate velocity models for the depth migration. Annually, on average, 6 depth migration projects are completed which are executed by both the PDO’s in-house contractor CGG and in-house processing team. the value of the combination of PreSDM and WAZ data will be assessed by looking at differences in seismic quality over critical areas and evaluating the value of recent discoveries that were not seen on older generation seismic data versus the costs of the new seismic. For a typical depth migration, 3 iterations (on average) of velocity model updating are required to flatten the common image gathers. on average 6 horizons are interpreted for each PreSDM iteration. This means that annually in the order of 100+ horizons need to be re-interpreted. Beside the requirement that the interpretation has as an input on building the velocity mode, the interpretations done on early seismic volume (Not final) also allow the early identification of prospectivity. The PSDM final seismic volume has had huge impact on rejuvenating PDO’s portfolio, identifying new deep gas discoveries, avoiding dry holes and in the safely execution of drilling activity.


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